CFD Simulation of Ethanol Steam Reforming System for Hydrogen Production
Abstract
:1. Introduction
1.1. Mechanism of Steam Ethanol Reforming Process
1.2. Ethanol Burner Steam Reformer
- (1)
- Convection
- (2)
- Radiation
- (3)
- Conduction
1.2.2 Convection
1.2.3 Radiative Heat Transfer
1.2.4 Conduction Heat Transfer
2. Materials and Methods
2.1. Fire Dynamic Simulation Modeling of the Burner
2.2. Governing Equations of FDS Software
2.2.1. Mass and Species Transport
2.2.2. Momentum Transport
2.2.3. LES
2.2.4. Energy Transport
2.2.5. Equation of State
2.2.6. FDS Modelling of the Ethanol Burner
- (1)
- The thermal diffusivity of the ethanol is low (the ratio between the thermal conductivity and the heat capacity multiplied by the density). Therefore, the heat front penetrates within a short distance inside the ethanol pool.
- (2)
- The radiative heat flux is attenuated inside the liquid phase.
- (3)
- The internal flow inside the liquid can be neglected (natural convection). Therefore, the convective heat transfer inside the ethanol liquid pool can be neglected.
2.3. Multiphysics Analysis of the Reformer Model
2.3.1. Model Kinetics—Reformer Bed
2.3.2. Fluid Flow—Reformer Bed
2.3.3. Energy Transport—Reformer Bed
2.3.4. Mass Transport—Reformer Bed
2.3.5. Calculation of the Binary Diffusion Coefficients—Reformer Bed
2.3.6. Structural Analysis—Reformer Bed and Steel Tube
3. Results
3.1. Fire Dynamics Simulator Software Results
3.2. Multi-Physics Analysis of the Operation of the Ethanol Steam Reformer
3.2.1. Multiphysics Results for Low Heat Flux Input
3.2.2. Multiphysics Results for High Heat Flux Input
4. Discussion
5. Conclusions
Funding
Conflicts of Interest
References
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Material Property | Value |
---|---|
rho | 3960 (kg/m3) |
Cp | 880 (J/(kg·°C)) |
k | 33 (w/(m·°C)) |
Lennard-Jones Collision Diameter | (Angstroms) |
Ethanol | 4.455 |
H2O | 2.655 |
CH4 | 3.882 |
CO | 3.590 |
CO2 | 3.996 |
H2 | 2.968 |
Maximum Attractive Energy between Two molecules | (K) |
Ethanol | 391.0 |
H2O | 363.0 |
CH4 | 136.5 |
CO | 110.3 |
CO2 | 190.0 |
H2 | 33.3 |
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Davidy, A. CFD Simulation of Ethanol Steam Reforming System for Hydrogen Production. ChemEngineering 2018, 2, 34. https://doi.org/10.3390/chemengineering2030034
Davidy A. CFD Simulation of Ethanol Steam Reforming System for Hydrogen Production. ChemEngineering. 2018; 2(3):34. https://doi.org/10.3390/chemengineering2030034
Chicago/Turabian StyleDavidy, Alon. 2018. "CFD Simulation of Ethanol Steam Reforming System for Hydrogen Production" ChemEngineering 2, no. 3: 34. https://doi.org/10.3390/chemengineering2030034